I am always looking to improve my fly fishing skills. Recently i noticed i have lost some decent size trout for the area i fly fishing in. Last week i lost a ~20" brown at the net, and today i lost one that looked to be ~15" and another that looked to be about ~17". The hook on the fly is pretty sharp, i did a nail check.

Any tips to help prevent this from happening? It seems to be occuring a lot. Thanks for any tips and help.

Greg beat me to the punch on the questions there... also, what sort of net are you using? I tend to prefer a slightly longer-handled net which I then tuck into my wading belt behind my backpack. It slightly limits the extreme angles needed to net a fish while holding a rod, the same angles that are called "high-sticking" when fighting a fish and often lead to lost fish. While the long-handled net is usually used because I'm landing lake-run fish for friends, it also helps when fishing solo giving the little bit of extra reach.

It seems that the trout are throwing the hooks. I have them on the fly with what i thought was a nice hook set each time. I get them close enough to see what I have on and all of a sudden the hook comes out. It is just disappointing not to be able to take a few pics of the sweet catch! The one that was ~20" was a real beauty. Looked like a mini alligator! Had a nice hook jaw. This seems to only occur when i am using streamers. Dry flies and nymphs i usually get the fish in the net. The net i am using is a short handle.

Fish just don't "throw a hook". It's possible of course especially with barbless hooks, but typically it's the smaller fish that wiggle around so much that this happens.
Second of all, it's called fishing not catching, and unless you feel the need to publish a photo of every fish you take, you probably didn't need to take it from the water and were going to release it anyway. The "long line release" is better for the fish.
Third... like Randy says... keep a tight line. It's the slack that give the trout a chance.

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"There's more B.S. in fly fishing then there is in a Kansas feedlot." Lefty Kreh
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You shouldn't worry about it....you're going to release the trout anyway,aren't you?So...maybe you're a bit nervous to lose a fish...it's the best way to do it
What is interesting is to lure the fish....landing it when it's a beauty is the icing on the cake

That's what i say, I release all my fish. once the fish is at my feet or head out of the water. I consider it caught. Unless it's a big one , maybe a quick photo. I do not like handling the fish if possible for there sake.